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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.00308 |
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| _version_ | 1866908851193774080 |
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| author | Haikala, Lauri K. Mattila, Kalevi Väisänen, Petri |
| author_facet | Haikala, Lauri K. Mattila, Kalevi Väisänen, Petri |
| contents | We present results of a measurement of the near infrared Extragalactic Background Light using the dark-cloud method. Long-slit spectra covering the opaque core of the intermediate--latitude globule DC303.8-14.2 and the almost unobscured off area were measured using nodding-along-the-slit measuring technique providing a differential spectrum free of most of the foreground components. A template for the only remaining major foreground component, the scattered integrated starlight dominated by the strong Ca II triplet lines at 8498, 8542, 8664$Å$, from the dark core itself was constructed using the GAIA RVS spectral database. The derived EBL intensity is $1.62\pm 0.76(σ_{stat})\, 10^{-9} erg\, cm^{-2} s^{-1}Å^{-1} sr^{-1}$ or $13.8\pm6.5(σ_{stat})$nW m$^{-2}$sr$^{-1}$; this represents a tentative detection at $2.1σ$, level. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00308 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Measurement of the extragalactic background light at 8600Å using dark cloud shadow and the CaII-triplet lines Haikala, Lauri K. Mattila, Kalevi Väisänen, Petri Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies We present results of a measurement of the near infrared Extragalactic Background Light using the dark-cloud method. Long-slit spectra covering the opaque core of the intermediate--latitude globule DC303.8-14.2 and the almost unobscured off area were measured using nodding-along-the-slit measuring technique providing a differential spectrum free of most of the foreground components. A template for the only remaining major foreground component, the scattered integrated starlight dominated by the strong Ca II triplet lines at 8498, 8542, 8664$Å$, from the dark core itself was constructed using the GAIA RVS spectral database. The derived EBL intensity is $1.62\pm 0.76(σ_{stat})\, 10^{-9} erg\, cm^{-2} s^{-1}Å^{-1} sr^{-1}$ or $13.8\pm6.5(σ_{stat})$nW m$^{-2}$sr$^{-1}$; this represents a tentative detection at $2.1σ$, level. |
| title | Measurement of the extragalactic background light at 8600Å using dark cloud shadow and the CaII-triplet lines |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.00308 |